Joseph,
time-nuts-boun...@febo.com wrote on 01/07/2009 10:47:46 PM:
Joseph,
Could be a differential TX and RX. I recall that they send a RS422
signal.
Depending on the speed, RS422 works fine with transformers.
Yes. It would be 10 MHz or 20 MHz, depending on coding. Or 5 MHz, so
Magnus,
At 10:31 AM + 1/10/09, time-nuts-requ...@febo.com wrote:
Message: 5
Date: Sat, 10 Jan 2009 11:06:39 +0100
From: Magnus Danielson mag...@rubidium.dyndns.org
Subject: Re: [time-nuts] Standards sought for immunity of shielded
cable links to power-frequency ground loops
To:
Joe,
For digital signals (1PPS, various triggers), it's RS422 over 100 ohm
twinax (fancy shielded twisted pair).
The 10 MHz sinewave is sent over a pair of 50 ohm coax links, with the
signals 180 degrees out of phase. This is acheived with a pair of hybrid
transformers which convert
Get 'em to use twin-ax (twisted pair inside screen) like the IBM AS/400
terminals (5250?) send differential signal down the cable.
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Joe Gwinn
Sent: 10 January 2009 15:23
To:
Or 1553, for that matter
-Original Message-
From: David C. Partridge david.partri...@dsl.pipex.com
Get 'em to use twin-ax (twisted pair inside screen) like the IBM AS/400
terminals (5250?) send differential signal down the cable.
Dave
___
Magnus,
At 6:02 PM + 1/10/09, time-nuts-requ...@febo.com wrote:
Message: 4
Date: Sat, 10 Jan 2009 19:02:09 +0100
From: Magnus Danielson mag...@rubidium.dyndns.org
Subject: Re: [time-nuts] Standards sought for immunity of shielded
cable links to power-frequency ground loops
To:
In message of3277ac5a.f5d1fae8-on85257537.008059cf-85257537.00817...@mck.us.ra
y.com, Joseph M Gwinn writes:
That's technically speaking not triax, that's double shield. Triax
would have the conductors and one shield.
No, I think that's twinax: http://en.wikipedia.org/wiki/Twinax_cable.
In message 49657762.5060...@rubidium.dyndns.org, Magnus Danielson writes:
Was there a big bang? What was the source of the 600 amps?
I think there (with some delay) was some awfull scream of dispare.
The cost of Ethernet interfaces where much more significant back then.
The most expensive
Poul-Henning Kamp wrote:
In message
of3277ac5a.f5d1fae8-on85257537.008059cf-85257537.00817...@mck.us.ra
y.com, Joseph M Gwinn writes:
That's technically speaking not triax, that's double shield. Triax
would have the conductors and one shield.
No, I think that's twinax:
In message 49665a6d.2030...@xtra.co.nz, Bruce Griffiths writes:
I have been unable to find a reference to triax consisting of 3
conductors within a shield, however such confusion is understandable
given the confusion over quadrax:-
I have only ever seen it used for very old 3-electrode condenser
Magnus,
time-nuts-boun...@febo.com wrote on 01/07/2009 10:47:46 PM:
Joseph,
Could be a differential TX and RX. I recall that they send a RS422
signal.
Depending on the speed, RS422 works fine with transformers.
Yes. It would be 10 MHz or 20 MHz, depending on coding. Or 5 MHz,
time-nuts-boun...@febo.com wrote on 01/08/2009 03:47:29 AM:
In message OF3277AC5A.F5D1FAE8-ON85257537.008059CF-85257537.
00817...@mck.us.ray.com, Joseph M Gwinn writes:
Was there a big bang? What was the source of the 600 amps?
They replaced the separation transformer with a UPS, and
On Thu, Jan 08, 2009 at 08:51:45AM +, Poul-Henning Kamp wrote:
In message 49657762.5060...@rubidium.dyndns.org, Magnus Danielson writes:
Was there a big bang? What was the source of the 600 amps?
I think there (with some delay) was some awfull scream of dispare.
The cost of
Joseph,
Joseph M Gwinn skrev:
Magnus,
time-nuts-boun...@febo.com wrote on 01/07/2009 01:27:52 AM:
Joseph M Gwinn skrev:
First the background:
In some timing distribution applications, the primary source of
interference comes from different ground voltages in different parts
of
In message ofade54b4f.d29dba7a-on85257537.00086866-85257537.00090...@mck.us.ra
y.com, Joseph M Gwinn writes:
The effect of differing ground potentials on a shielded cable is to pull a
large current through the shield, [...]
The correct enginering solution is to use twinax, ground the shield
in
Magnus,
time-nuts-boun...@febo.com wrote on 01/07/2009 01:27:52 AM:
Joseph M Gwinn skrev:
First the background:
In some timing distribution applications, the primary source of
interference comes from different ground voltages in different parts
of
the facility, such as a ship or
Poul-Henning,
time-nuts-boun...@febo.com wrote on 01/07/2009 04:25:04 PM:
In message OFADE54B4F.D29DBA7A-ON85257537.00086866-85257537.
00090...@mck.us.ra
y.com, Joseph M Gwinn writes:
The effect of differing ground potentials on a shielded cable is to
pull a
large current through the
In message of56303512.93b049a7-on85257537.0079cde3-85257537.007cc...@mck.us.ra
y.com, Joseph M Gwinn writes:
Could be a differential TX and RX. I recall that they send a RS422 signal.
Depending on the speed, RS422 works fine with transformers.
I imagine that the shield is grounded at both
Poul-Henning,
time-nuts-boun...@febo.com wrote on 01/07/2009 05:56:19 PM:
In message OF56303512.93B049A7-ON85257537.0079CDE3-85257537.
007cc...@mck.us.ra
y.com, Joseph M Gwinn writes:
Could be a differential TX and RX. I recall that they send a RS422
signal.
Depending on the speed,
Poul-Henning Kamp skrev:
In message
of56303512.93b049a7-on85257537.0079cde3-85257537.007cc...@mck.us.ra
y.com, Joseph M Gwinn writes:
Could be a differential TX and RX. I recall that they send a RS422 signal.
Depending on the speed, RS422 works fine with transformers.
You want a DC
Joseph,
Could be a differential TX and RX. I recall that they send a RS422
signal.
Depending on the speed, RS422 works fine with transformers.
Yes. It would be 10 MHz or 20 MHz, depending on coding. Or 5 MHz, so the
transitions are at 10 MHz. I don't recall, or never knew.
RS422
First the background:
In some timing distribution applications, the primary source of
interference comes from different ground voltages in different parts of
the facility, such as a ship or a megawatt radar.
The effect of differing ground potentials on a shielded cable is to pull a
large
During my experiences involving audio/phone, video and data
transmission, we were taught to ground the shield at one end only so we
would not cause a ground loop.
I ran into problems everywhere I went with this and as much as folks
disdain transformers, they are your friend in this type of
At 4:59 AM + 1/7/09, time-nuts-requ...@febo.com wrote:
Message: 6
Date: Tue, 06 Jan 2009 21:54:41 -0600
From: Brian Kirby kirb...@bellsouth.net
Subject: Re: [time-nuts] Standards sought for immunity of shielded
cable links to power-frequency ground loops
To: Discussion of precise time
Joseph M Gwinn skrev:
First the background:
In some timing distribution applications, the primary source of
interference comes from different ground voltages in different parts of
the facility, such as a ship or a megawatt radar.
The effect of differing ground potentials on a shielded
25 matches
Mail list logo
